"Google updated its Chrome browser's developer's builds to version 5 for Windows and Mac today, the first time any version of Chrome has reached that milestone. Google was expected to push version 5 out to the public before the end of the month. Unlike the more recent versions of developer's build 4.x, the developer's builds of Chrome 5.x seems to be starting off to a rough start."

It depends on what OS you're on. On Windows and Linux, Chrome is noticeably faster and has a more responsive UI than Firefox/Opera. (Also I just dislike the Opera UI in general, but that's just me.) On the Mac performance isn't really good enough to justify switching, IMO.

For me, Chrome on OS X is a lot more snappier than Firefox, especially on Javascript-heavy sites. And since recent development builds support extensions (and thus adblocking), I have switched to Chrome as my primary browser.

Well, I still use Firefox but Chromes scalability (no change in performance when opening a lot of tabs) is a very compelling reason for me. Firefox gets VERY slow when I open a lot of tabs. Oh and still no JavaScript JIT for x86_64 in Firefox! WTF?

I yet have to find a good reason to leave Opera or Firefox for Chrome... Speed and extensions are certainly not compelling reasons anymore.

It makes a good second browser, and the light resource usage makes it nice for laptops (and netbooks, I would presume). In a pinch, it's very handy to have a browser that is usable almost immediately after clicking the icon.